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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Positive natural selection in the human genome

Hu, Min January 2013 (has links)
No description available.
12

Studies on polymorphic alu insertions and genomic diversity within the major histocompatibility complex

ddunn@cbbc.murdoch.edu.au, David Suliman Dunn January 2005 (has links)
After the initiation of the human genome sequencing project and the introduction of the field of ‘bioinformatics’, interest in human genetic diversity studies has been increased. Sequence diversity has helped define differences between genes and genomic regions that were previously unknown or difficult to determine. In this thesis I have undertaken to study sequence diversity in the human genome in three areas; 1) investigated diversity in the MHC as represented by the MICA alleles with respect to the known HLA alleles, 2) investigated the structure and diversity in the intergenic region from an MHC related (paralogous) genomic region and related the structural and diversity findings to the knowledge available on the MHC and the wider genome, and 3) described the identification of three and characterization of five new MHC class I polymorphic markers (Alu) and their polymorphic characteristics in worldwide populations and their associations with skin cancer. 1. Phylogenetic analysis of MICA alpha-domain (extracellular) sequences demonstrated relationships with HLA-B cross-reactive serogroups. The HLA-B and MICA loci are in linkage disequilibrium. The data indicated that MICA and HLA-B have evolved in concert from their common ancestors and that the transmembrane polymorphisms have arisen independently and more recently. 2. Sequence analysis of the CD1 genomic region confirmed the presence of five CD1 genes and revealed that there are four unrelated intergenic regions (IGRs). The IGRs are composed mostly of retroelements including five full-length L1 PA sequences and various pseudogenes. Genomic and phylogenetic analyses support the view that the human CD1 gene copies were duplicated prior to the evolution of primates and the bulk of the HLA class I genes found in humans. 3. Five polymorphic Alu insertions (POALINs) were identified (two from previous studies) and located within the 1.8 megabase of the MHC class I genomic region. All five POALINs are polymorphic, and are positively associated with the HLA-A and HLA-B alleles. The AluyHJ insertion was found most frequently associated with HLA-A1 or A24, AluyHG with HLA-A2, AluyHF with HLA-A2, A-10 or -A26 and AluyTF showed a marginal association with HLA-A29. The AluyMICB insertion was strongly associated with HLA-B17 (HLA-B57, HLA-B58) and HLA-B13. The presence of three Alu insertions (AluyHJ, AluyHG and AluyHF) was found in only one HLA class I haplotype (HLA-A1, -B57, -Cw6) in the 10th IHW cell lines. A novel positive association between the presence of AluyMICB and the ‘MICAdel/MICBnull/HLA-B48’ haplotype was determined. The AluyMICB insertion was also associated with at least three different MICB alleles (*0102, *0107N and *0105) and three different HLA-B alleles (B13, B48 and B57). Based on the analysis of associations between different polymorphic markers within the beta block, the MICB*0102 allele was inferred to be the ancestral form of the MICB*0105 and MICB*0107N alleles. The AluyMICB polymorphism can be used to further investigate haplotype relationship and consequently their lineage origins. Some of the MHC POALINs are haplospecific and associate strongly with certain groups of HLA class I alleles and MHC ancestral haplotypes. The AluyTF frequency was significantly associated with skin cancer (p<0.005). MICA gene diversity is derived from two different evolving paths, therefore one or the other alone cannot reliably mark an ancestral haplotype. The CD1 duplicons originated well before the HLA class I duplicons. The MHC POALINs provide new lineage and linkage markers for the fine mapping study of different haplotypes and variations in linkage groups across 1.8 Mb of the MHC class I region. The POALINs may also prove useful in investigating the origins and history of human populations and in determining the role of human genetic diversity in disease risk.
13

Studies on polymorphic alu insertions and genomic diversity within the major histocompatibility complex /

Dunn, David Suliman. January 2005 (has links)
Thesis (Ph.D.)--Murdoch University, 2005. / Thesis submitted to the Division of Science and Engineering. Bibliography: leaves 220-245.
14

Importance of the conserved TG/CA dinucleotide termini in phage Mu transposition similarities to transposable elements in the human genome /

Lee, Insuk. January 2002 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.
15

Pedigree analysis and gene mapping

Bryant, Stephen Paul January 2001 (has links)
No description available.
16

Development of methodologies for the analysis of copy number alterations in tumour samples

Weck, Antoine de January 2011 (has links)
The genetic basis of the different cancer phenotypes has been a continuous and accelerating subject of investigation. Data accumulated thanks to recently introduced genome-wide scanning technologies have revealed that human diversity and diseases susceptibility is also greatly influenced by structural alterations in the human genome, such as DNA copy number variants (CNVs) and copy number alterations (CNAs), which influence gene expression in both healthy and pathological cells. Our research aims to investigate the influence of structural alterations on gene expression in cancer cells using SNP microarray data. Specifically, we focus on analyzing DNA copy number alternations (CNAs), which can significantly influence gene expression in cancer cells. Several cancer-predisposing mutations affect genes that are responsible for maintaining the integrity of the chromosomes during cell division, which can result in translocations, gains or losses of large parts of chromosome. To our knowledge, there have been no publications that link whole-genome copy number alterations in cancer to gene expression variations using the full range of possibilities offered by SNP arrays. The accurate use of SNP arrays in the analysis of cancer has been difficult due to tumour purity, tumour heterogeneity, aneuploidy/polyploidy and complex patterns of CNA and loss-of-heterozygosity (LOH). In our work, we use and further extend a recently developed novel tool for tumour genome profiling called OncoSNP (Yau, Mouradov et al. 2010), in order to resolve some of those problems and accurately estimate copy number alterations (CNA) and loss-of-heterozygosity (LOH) from SNP array data in cancer cell samples. The methods developed in this thesis tackle the problem of cancer genomic investigation by developing and validating an extension (DPS smoothing) of a new method (OncoSNP). This approach is used in the analysis of global expression versus CNA patterns in experimental systems and large clinical datasets. We analyse various cancer SNP and gene expression arrays of increasing complexity and heterogeneity, starting with a dataset of head and neck squamous cell carcinoma (HNSCC) cell lines, followed by leukaemia samples and finally a large breast cancer dataset. The central findings of our research are multifold. In the HNSCC dataset we find that the level of genetic instability is not indicative of the pathological state; i.e. there are premalignant lesions displaying extensive mutations. However some genetic features are typical of certain lesion type; e.g. we consistently observe copy loss in the short arm of chromosome 3 in carcinoma. The pattern of homozygous deletion in the dataset reveals common deletion of cancer related genes, especially CDK4 (pI6). Furthermore we notice a significant positive correlation between the copy number and the expression on a systematic level. In Leukaemia, we do not observe extended uniparental disomy as previously published (Akagi, Shih et al. 2009) and expected. However large alterations (whole arm amplification) are observed in individual patients: copy loss in chromosome 7 (2 patients), copy gain in chromosome 8 (3 patients) as well as common alterations around the centromeres and telomeres. In the breast cancer dataset significantly different level of mutations were observed in the different subtypes in the cohort. Furthermore 499 genes were identified with significant correlation between their gene expression (GE) and underlying genomic alterations (either copy number (CN) or loss-of-heterozygosity (LOH)). Performing hierarchical clustering on the cohort using the 499 correlated genes enabled us to recover the subtypes' separation previously based on gene expression alone.
17

Genome-wide association study of bone mineral density in Chinese

Xiao, Sumei. January 2010 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 150-166). Also available in print.
18

Evaluation of genome designs for oxidation resistance guanine minimization and scavenger guanine /

Friedman, Keith Albert. January 2003 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.
19

Evaluation of genome designs for oxidation resistance: guanine minimization and scavenger guanine

Friedman, Keith Albert 28 August 2008 (has links)
Not available / text
20

A study of the role of G-Quadruplexes in the Human genome

Shahid, Ramla January 2011 (has links)
No description available.

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